int main(void){
	int i,a, b;
	printf("enter two numbers:");
	scanf("%d %d", &a, &b);
	for(i=0; i<5316; i++){
		printf("*");
	}
	printf("\nadd:%d\n", add(a, b));
	printf("sub:%d\n", sub(a, b));
	printf("mul:%d\n", mul(a, b));
	printf("div:%lf\n",div(a, b));
	return 0;
}
